CN100534010C - TD-SCDMA system base station radio-frequency digital long-drawn optical fiber transmitting method and apparatus - Google Patents
TD-SCDMA system base station radio-frequency digital long-drawn optical fiber transmitting method and apparatus Download PDFInfo
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- CN100534010C CN100534010C CN 200610020350 CN200610020350A CN100534010C CN 100534010 C CN100534010 C CN 100534010C CN 200610020350 CN200610020350 CN 200610020350 CN 200610020350 A CN200610020350 A CN 200610020350A CN 100534010 C CN100534010 C CN 100534010C
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Abstract
This invention is fiber-optical transmission method for drawing far away the TD-SCDMA system base station radio-frequency digit. The radio-frequency signal receiver-transmitter in wireless base station and base band digital signal processing part in wireless base station are separated and drawn far away to antenna neighborhood. After digitizing the intermediate-frequency port of radio-frequency signal receiver-transmitter, the received and transmitted digital data stream signal, controlling or detecting digital signal and referenced clock signal are respectively modulated to corresponding light wavelength. After making the optical signals corresponded to each radio-frequency receiver-transmitter confluent, an optical fiber is used to up-transmitting and down-transmitting respectively. At the receiving end, the confluent signal is split in terms of wavelength. The split signals are demodulated to corresponding digital signals respectively. This invention also provides the radio-frequency signal receiver-transmitter and indoor base station interface card matching this transmission method.
Description
Technical field
The present invention relates in 3G (Third Generation) Moblie TD-SCDMA system transmission method behind the base station radio-frequency digital long-drawn and used related device, specifically is a kind of method of Optical Fiber Transmission and device correspondingly of adopting.
Background technology
Technology that Chinese patent application numbers 200510001653.2 provides a kind of " base station equipment realizes intermediate frequency transmission method and the IF interface that radio frequency zooms out ", in the TD-SCDMA system with base station radio-frequency digital long-drawn after, use the analog intermediate frequency transmission technology to make the far end radio frequency analog transceiver believe that the machine unit is connected with the wireless base station with various wired and wireless transmission means.Wherein, can use a pair of transmission medium to realize comprising as several different methods such as star, chain and annulars respectively to many far end radio frequency analog transceiver letter machine unit is connected.This method is that the base station is modulated under the intermediate frequency carrier frequency the analog if signal between each radio-frequency (RF) transceiver, and clock and pilot signal also respectively take an intermediate frequency carrier frequency.Fig. 1 has shown the basic mode of its connection.The main body of its base station is an indoor base station equipment, and it provides Iub interface (154) to system (RNC).In indoor base station, concentrated control/interface unit (146) and reference (benchmark) clock unit (145) are arranged; There are many covers to finish the modem module (144) of baseband digital signal processing (normally each sub-district one cover).Be connected with high-speed figure bus (153) between control/interface unit and each modem module; Control/interface unit is connected with all parts of this base station with control bus (152).In addition, this base station also has many cover digital IF processing units (143) (normally each sub-district one cover), it is finished the numeral of receiving and dispatching intermediate-freuqncy signal and extremely simulates and simulate to signal processing such as digital conversion and filtering, is connected with modem module by signal bus (151); Every cover or overlap the shared analog intermediate frequency interface of digital IF processing unit (143) (131,132,133 etc.) more.By this analog intermediate frequency interface, be connected to analog radio frequency transceiver far away with immediate frequency cable, microwave relay unit or optical fiber.For example available fiber be connected to far-end one group of analog radio frequency transceiver unit (101,102 ..., 10n) time, what adopt is the mode connected in series of chain type, promptly be connected to a far-end analog radio frequency transceiver (10n) earlier, be connected to other far-end analog radio frequency transceiver by (10n) again, until (101); Or the employing Y-connection, promptly use immediate frequency cable (also can use optical fiber) to be connected to the far-end analog radio frequency transceiver unit 111 of many antennas; Also can adopt wireless connections, promptly use immediate frequency cable (also can use optical fiber) to be connected to microwave relay unit (122), by the other end (123) of microwave transmission, be connected to far-end analog radio frequency transceiver (125) by immediate frequency cable or optical fiber more again to microwave relay unit.In this kind base station, above-mentioned analog intermediate frequency interface has a plurality of, and a plurality of to be connected to (group) far-end analog radio frequency transceiver is formed sub-district one by one at far-end.To use Y-connection between the far end radio frequency transceiver unit (as 111,125) that disperses to set up and the indoor base station, promptly indoor base station IF interface (132,133) is connected to one by a transmission medium and overlaps far-end analog radio frequency transceiver unit.And set up concentrating relatively (for example in one or the one group of building and contiguous indoor and outdoor covering) many far-end analog radio frequency transceivers (101,102 ..., 10n), then can use being connected of they and indoor base station connected in series, an IF interface (131) of common accessing indoor base station, all use a transmission medium and need not each far-end analog radio frequency transceiver, respectively many IF interfaces of accessing indoor base station.
Above-mentioned analog intermediate frequency transmission means is because the loss ratio of transmission medium reaches high linear requirement more greatly, not only cost is still high, and transmission range is also shorter, only can transmit when for example using immediate frequency cable about 300m, also can only transmit about 10km when using the analog optical fiber transmission technology.And the demand on the present market is to zoom out required distance need reach 40km at least, therefore must adopt the digital fiber transmission technology.Especially to using the system of smart antenna, as the far-end unit 111 that has a plurality of radio-frequency (RF) transceiver among Fig. 1, because each radio-frequency (RF) transceiver (outdoor far end radio frequency transceiver adds the interface card of indoor base station) needs to use same local oscillator in the system, reach the purpose of coherent reception and emission, make said method be difficult to simple realization, and its indoor base station end interface card more complicated, cost is higher.
Use the Optical Fiber Transmission high-speed digital signal to carry out indoor base station when being connected in present broad research with the far end radio frequency transceiver, because in a pair of optical fiber, transmit high-speed digital signal, pilot signal and high stable clock signal from a plurality of carrier frequencies of a plurality of far end radio frequency transceivers, must determine a kind of mode and rule of data multiplexing, they are combined into a high-speed figure stream, transmit with an optical fiber again.On the mode of data multiplexing, general, adopt Synchronous Digital Hierarchy (SDH) agreement or Ethernet (Ethernet) agreement.In order to guarantee the transmission quality of digital signal, adopt the mode of SDH mostly, the needed digital dock of far end radio frequency transceiver then adopts the employed clock recovery method of SDH technology to extract, be about to clock signal also multiple connection on high-speed data-flow.And the clock signal quality that obtains by this way still can't satisfy the requirement of mobile communication.And, use the shortcoming of the digital intermediate frequency transmission means of SDH mode also to be the digital bandwidth that produces behind the digital multiplexing big (near 10Gbps), the difficulty that causes is higher, causes cost also just than higher.Thereby it mainly is used in point-to-point connection at present, can't solve the multiple connected mode of actual engine request.
Summary of the invention
At above-mentioned situation, the present invention at first will provide a kind of optical fiber transmission method of the TD-SCDMA of being used for system base station radio-frequency digital long-drawn, this method can overcome the above-mentioned transmission range that can not increase greatly completely after zooming out, and can reduce the complexity of interface circuit, and equipment disposition is flexible, can adapt to various fiber optic network situation and adopt different equipment disposition, carry out the mobile radio communication engineering design neatly.On this basis, further aim of the present invention provides corollary equipments such as the radio-frequency (RF) transceiver that adapts with this optical fiber transmission method and indoor base station interface card.
The present invention is used for the optical fiber transmission method of TD-SCDMA system base station radio-frequency digital long-drawn, be that the baseband digital signal processing section of the radio-frequency (RF) transceiver in the wireless base station with the wireless base station separated, and radio-frequency (RF) transceiver zoomed out near the basis the antenna, after making the intermediate frequency port digitlization of radio-frequency (RF) transceiver, the digital data stream signal that each radio-frequency (RF) transceiver is received and launches, control or monitoring digital signal, and the reference number clock signal is modulated on the corresponding optical wavelength respectively, after will closing the road with the corresponding lightwave signal of each radio-frequency (RF) transceiver with wave division multiplex mode, carry out the transmission of up direction and down direction with one with optical fiber respectively, receiving terminal then again by wavelength separately and respectively demodulation revert to digital signal corresponding.This processing method both can be used for the difference independent transmission that indoor base station and a plurality of far end radio frequency transceiver carry out point-to-points point type, also can be used for indoor base station and compile the transmission of carrying out point-to-point formula between the concentrated site that a plurality of radio-frequency (RF) transceiver are arranged.
On above-mentioned optical fiber transmission method basis, can also be according to the frame structure of TD-SCDMA system and the characteristics of time division duplex work system, carrying out wave division multiplex mode when handling, further with earlier that speed is different with the coded system digital data stream signal of following time division multiplexing mode, control or monitoring digital signal and reference number clock signal by the time separately and respectively multiple connection be one group of serial data stream:
When each far end radio frequency transceiver carries out the tap of uplink, pick out corresponding data at different moment branches, and its Monitoring Data is compressed into after short burst that a time width is no more than a TD-SCDMA time slot is inserted in the up TD-SCDMA time slot TS0, become a complete upstream with the up reception data multiplexing that is present among the TS1 to TS5;
Indoor base station will be used for control data to each far end radio frequency transceiver and be compressed into the short burst that a time width is no more than a TD-SCDMA time slot and be inserted in the descending TD-SCDMA time slot TS1, the reference number clock signal that is provided is compressed into time width is no more than one and is inserted in the interval that comprises G and UpPTS sum, and make these two short bursts and become a complete downstream data flow with the downlink data multiplexing that is present among the TS2 to TS6 at TS0 by protection time slot (G) another short burst with up guide time slot (UpPTS) sum;
The far end radio frequency transceiver relates to digital data stream signal, control or monitors digital signal and the different up and downlink data of reference number clock signal multichannel what transmitted with indoor base station, is modulated on the specific wavelength of light after the transmitting terminal multiple connection becomes one tunnel data flow of separating by the time respectively and transmits; Corresponding receiving terminal carries out tap and reverts to corresponding multichannel data according to the content of data in the different time-gap again the data flow that is received.
One can be for reference employing said method of the present invention carry out indoor base station and compile in the example of the point-to-point formula transmission between the concentrated site that a plurality of radio-frequency (RF) transceiver are arranged, be that the received digital data stream signal of each radio-frequency (RF) transceiver that this concentrated site connects and control and the monitoring digital signal to a plurality of radio-frequency (RF) transceiver of this concentrated site are modulated at respectively on the optical wavelength, transfer to indoor base station through uplink optical fiber of photosynthetic Lu Houyong; Need digital data stream signal, indoor base station that the digital signal and the reference number clock signal of these radio-frequency (RF) transceiver controls also respectively are modulated at respectively on the optical wavelength from indoor base station, transfer to this concentrated site through downlink optical fiber of photosynthetic Lu Houyong through each radio-frequency (RF) transceiver emission; At each receiving terminal place then by the wavelength of received signal separately and respectively demodulation revert to digital signal corresponding.
When indoor base station carries out the transmission of point-to-points point type with a plurality of far end radio frequency transceivers that lay respectively at diverse location, can be with the uplink and downlink digital signal between indoor base station and each far end radio frequency transceiver respectively respectively with an Optical Fiber Transmission.Wherein, the uplink signal of each far end radio frequency transceiver is for monitoring the whole number signal that digital signal is multiplexed in the time division multiplexing mode with digital data stream signal and this radio-frequency (RF) transceiver that this radio-frequency (RF) transceiver receives; The whole number signal that is multiplexed to for the digital signal the digital data stream signal of this radio-frequency (RF) transceiver emission, indoor base station controlled this radio-frequency (RF) transceiver in the time division multiplexing mode and reference number clock signal by the downstream transmission signals of indoor base station.On the basis, the transmission of this point-to-multipoint can be adopted the Optical Fiber Transmission of the multiple different connected modes such as star, chain or annular that aforementioned patent provides respectively.
For example, when indoor base station and a plurality of far end radio frequency transceivers that lay respectively at diverse location carry out point-to-points point type transmission and adopt the Y-connection mode, can with between indoor base station and each far end radio frequency transceiver up/be modulated at separately on the wavelength in the time division multiplexing mode respectively during downlink transfer, directly be connected transmission by indoor base station with each far end radio frequency transceiver with separate a pair of optical fiber respectively.
Carry out point-to-points point type transmission at indoor base station and a plurality of far end radio frequency transceivers that lay respectively at diverse location and adopt the chain connected mode, can be connected with indoor base station with an optical fiber by the radio-frequency (RF) transceiver that is positioned at an end position in its chain type serial connection by after with each far end radio frequency transceiver of optical fiber chain type successively serial connection it being modulated at uplink digital optical signal on the different wave length respectively and closing the road step by step successively; The downlink transfer digital signal that indoor base station is sent to a plurality of far end radio frequency transceivers is modulated at respectively on the corresponding different wave length, another root optical fiber of ECDC Lu Houyong is connected with the radio-frequency (RF) transceiver that is positioned at this end position, transfer to each radio-frequency (RF) transceiver of other end direction more successively, and enter the corresponding radio frequency transceiver by the optical branching device of each radio-frequency (RF) transceiver.
When indoor base station and a plurality of far end radio frequency transceivers that lay respectively at diverse location carry out the annular connected mode of point-to-points point type transmission employing, the radio-frequency (RF) transceiver that is positioned at each the far end radio frequency transceiver end positions place that is connected in series successively by optical fiber respectively can be connected with indoor base station respectively with a pair of optical fiber with the same manner, each far end radio frequency transceiver is after being modulated at uplink digital signal on the wavelength separately respectively and closing the road step by step successively by an end to the other end, is connected with indoor base station through a pair of optical fiber wherein; The downlink transfer digital signal that indoor base station is sent to a plurality of far end radio frequency transceivers is modulated on the different wave length respectively, close and also optical fiber delivered to each far end radio frequency transceiver behind the road and the optical branching device through each radio-frequency (RF) transceiver place enters each corresponding far end radio frequency transceiver by this, at one time between said far end radio frequency transceiver and indoor base station at least one pair of in the two pairs of optical fiber in running order.
Above-mentioned optical fiber transmission method of the present invention can satisfy said wavelength division multiplexing method and the various corresponding manners of said time division multiplexing method requirement and/or the equipment realization that adapts in the above-mentioned transmission course by adopting.
Basic structure in a kind of radio-frequency (RF) transceiver that can adapt with the above-mentioned optical fiber transmission method of the present invention that can be for reference is provided with in the example, should comprise the digital received unit that has time division multiplexing circuit and specific wavelength optical sender, have a time-division and divide digital transmission unit, clock recovery and distributor circuit unit that connection circuit and optical receiver form and the microprocessor unit that this radio-frequency (RF) transceiver is monitored.Digital received unit wherein can be connected with antenna port through time division duplex device unit respectively with the digital transmission unit.Enter that the digital received unit is demodulated into downlink data, digital dock data and to these radio-frequency (RF) transceiver control data three tunnel dateouts from signal of base station through downlink transfer optical fiber: the one tunnel is admitted to the digital transmission unit and delivers to the antenna element port through time division duplex device unit for the downlink data; Another road is delivered to digital received unit, digital transmission unit and microprocessor unit for the digital dock data enter respectively after clock recovery and distributor circuit are handled; One the tunnel for to deliver to the microprocessor unit that is used to monitor to the control data of this radio-frequency (RF) transceiver again, and after by microprocessor unit monitor signal being sent into connected digital received unit, with the received signal that enters by antenna element port and time division duplex device unit, the complete data flow of uploading is exported by uplink optical fiber through its time-division multiplex circuit and specific wavelength optical sender.
Basic structure at a kind of indoor base station interface card that can adapt with the above-mentioned optical fiber transmission method of the present invention that can be for reference is provided with in the example, should be correspondingly provided with one group of multi-wavelength light transmitter unit and light receiving unit, respectively with the corresponding emission digital multiplexing circuit unit that is connected in these two unit and receive the digital demulplexing circuit unit and with main control processor microprocessor linked unit, base station.Wherein:
Include the optical wavelength-division multiplex unit that corresponds respectively to the required variant specific wavelength optical sender of far end radio frequency transceiver and be attached thereto in the multi-wavelength light transmitter unit.Import variant specific wavelength optical sender from the descending digital signal of baseband digital signal processing unit, reference number clock unit and microprocessor unit respectively through this emission digital multiplexing circuit respectively, export from descending output optical fibre interface by the optical wavelength-division multiplex unit;
Include the optical wavelength-division multiplex unit that corresponds respectively to each required optical receiver of far end radio frequency transceiver and be attached thereto in the light receiving unit.From the signal of up input optical fibre interface after this optical wavelength-division multiplex unit is sent into each optical receiver respectively, enter again can be respectively to the reception digital demulplexing of baseband digital signal processing unit and microprocessor unit output.
The optical fiber of the point-to-point and point-to-multipoint that can thoroughly solve the TD-SCDMA system base station radio-frequency digital long-drawn of said method of the present invention connects transmission problem.Can only reach with the transmission of the point-to-point or point-to-multipoint of present digital long-drawn and to zoom out 10km and compare, the inventive method can realize zooming out to 80km, has increased greatly and has zoomed out transmission range.Compare with using SDH realization digital optical fiber remote technology, then can save the difficulty and the corresponding clock restore circuit of high-speed data multiple connection and tap, greatly reduce the complexity of interface circuit.For example, roughly need use 1000 elements when realizing this scheme, an element surplus then only needing 10 when realizing the inventive method, and equipment disposition is flexible, can adopt different equipment disposition according to various different fiber network conditions, supporting point-to-point and/or point-to-multipoint, and support star network, loop network and recurrent network, the mobile radio communication engineering design of being more convenient for carrying out neatly.
Below, foregoing of the present invention is described in further detail again by embodiment by the accompanying drawing illustrated embodiment.
Description of drawings
Fig. 1 is that a plurality of far end radio frequency subsystems of report at present realize that with base station equipment the analog intermediate frequency that zooms out is connected and the transmission method schematic diagram.
Fig. 2 is the radio-frequency (RF) transceiver structural frames schematic diagram that is used to realize the optical fiber transmission method of TD-SCDMA system base station radio-frequency digital long-drawn of the present invention.
Fig. 3 is the structural representation that is used to realize a kind of radio-frequency (RF) transceiver of Fig. 7 block diagram.
Fig. 4 is a kind of structured flowchart of indoor base station interface card that is used to realize the optical fiber transmission method of TD-SCDMA system base station radio-frequency digital long-drawn of the present invention.
Fig. 5 is the sequential chart of time division multiplexing mode in the optical fiber transmission method of TD-SCDMA system base station radio-frequency digital long-drawn of the present invention.
Fig. 6 is the schematic diagram that the present invention realizes point-to-point digital fiber transmission method during to the TD-SCDMA system base station radio-frequency digital long-drawn.
Fig. 7 is the schematic diagram that the present invention realizes the star digital fiber transmission transmission method of point-to-multipoint during to the TD-SCDMA system base station radio-frequency digital long-drawn.
Fig. 8 is the schematic diagram that the present invention realizes the chain digital fiber transmission transmission method of point-to-multipoint during to the TD-SCDMA system base station radio-frequency digital long-drawn.
Fig. 9 is the schematic diagram that the present invention realizes the annular digital fiber transmission transmission method of point-to-multipoint during to the TD-SCDMA system base station radio-frequency digital long-drawn.
Embodiment
Fig. 2 and shown in Figure 3 be a kind of version of radio-frequency (RF) transceiver that is used to realize the optical fiber transmission method of TD-SCDMA system base station radio-frequency digital long-drawn of the present invention.
The basic structure of this radio-frequency (RF) transceiver 300 comprises the digital received unit 302 that has time division multiplexing circuit and specific wavelength optical sender, have digital transmission unit 303 that the time-division divides connection circuit and optical receiver to form, be made up of with circulator 346 and time division duplex (TDD) device unit 301, clock recovery and distributor circuit unit 348 that is connected with transmitter unit with this receiving element respectively and the microprocessor unit (MCU) 355 that this radio-frequency (RF) transceiver is monitored band pass filter 345.
Digital received unit 302 is made up of analog receiver 310 and local oscillation circuit 331, analog-to-digital converter (ADC) 341, reception digital intermediate frequency circuit 342, time division multiplexing circuit 343 and specific wavelength optical sender 344.Analog receiver 310 wherein comprises low noise amplifier 311, frequency mixer 312, analog intermediate frequency circuit 313 etc., is conventional superheterodyne receiver.Band pass filter 345 and the circulator 346 of signal through time division duplex device unit 301 from antenna port 360 enters analog receiver 310 amplification frequency conversions, in ADC 341, be converted to digital signal, carry out processing such as filtering through receiving digital intermediate frequency circuit 342 again, form the receiving digital signals of this radio-frequency (RF) transceiver, again with from monitor signal multiple connection in time division multiplexing circuit 343 of MCU 355 is complete reception (up) digital medium-frequency signal, be modulated to through specific wavelength optical sender 344 on the wavelength of appointment, through 361 outputs of uplink optical fiber.
The structure of the indoor base station interface card of shown in Figure 4 is a kind of optical fiber transmission method that is used to realize TD-SCDMA system base station radio-frequency digital long-drawn of the present invention.
Include in this interface card 400 multi-wavelength Optical Transmit Unit module 201, light receiving unit module 202, an emission digital multiplexing circuit unit 451, receive digital demulplexing circuit unit 452 and microprocessor (MCU) unit 460.
Wherein include in the Optical Transmit Unit module 201 of this multi-wavelength many different wave lengths as shown in Figure 3 specific wavelength optical sender 231,232 ..., 23N and light wavelength division multiplexing 211, connect with optical fiber 421 therebetween; Above-mentioned light receiving unit module 202 include light wavelength division multiplexing unit 212 and many optical receivers 251,252 as shown in Figure 3 ..., 25N, also connect therebetween with optical fiber 422.The Optical Transmit Unit module 201 of above-mentioned multi-wavelength and the light receiving unit module 202 of multi-wavelength all are made of commercial devices.This interface card is supported N far end radio frequency transceiver work shown in Figure 3.
Optical Transmit Unit module 201 is supported the radiating circuit on N road (N wavelength), and they come spontaneous emission digital multiplexing circuit unit 451.To transfer to from baseband digital signal processing unit 471 N great distance end-fire channel transmitter every road digital signal and in digital multiplexing circuit unit 451, carry out preliminary treatment from the reference number clock signal of reference number clock unit 480, that is: the data that will be transferred to each radio frequency sending set become a complete digital signal streams of each radio frequency sending set of confession separately and respectively with the reference number clock signal and realize time division multiplexing from the control data of MCU 460 with the time division multiplexing mode.
Light receiving unit module 202 is supported the receiving circuit on N road (N wavelength), and wherein N road (251 to 25N) is the complete data flow from N far end radio frequency receiver, will deliver to receive digital demulplexing circuit unit 452.In this digital demulplexing circuit unit 452 data flow from each radio-frequency (RF) transceiver is realized time-division tap upstream data and Monitoring Data through the time-division tap again.Upstream data transfers to baseband digital signal processing unit 472 by interface again; Monitoring Data is provided by MCU 460 processing that also provide to the interface 490 of base station main control processor.
Fig. 5 is the sequential chart of a kind of time division multiplexing mode of using in the optical fiber transmission method of the above-mentioned TD-SCDMA system base station radio-frequency digital long-drawn of the present invention.The method is separated the data of different rates, different coding mode according to the characteristics of the frame structure and the time division duplex of TD-SCDMA system by the time, multiple connection becomes one group of serial data stream.
When tap,, pick out different data at different moment branches according to known time division multiplexing mode.Fig. 5 A shows the frame structure of TD-SCDMS system; it is in the subframe of a 5ms; data slot TS0, TS1 that 7 width are arranged is 675 microseconds ..., TS6 and 3 special time slot: DwPTS (width 75 microseconds), UpPTS (width 100 microseconds) and protection time slot G (width 100 microseconds).Its downlink data take at most TS0, DwPTS, TS2, TS3 ..., TS6, and other time slot is always idle, shown in Fig. 5 B.The timing of use Fig. 5 C can the reference number clock signal that be provided be provided a time width and be no more than interval interior a transmission that is inserted in G+UpPTS by a short burst Tclk of protection time slot G and up guide time slot UpPTS sum; Use the timing of Fig. 5 D, control data can be collapsed into short burst (Burst) Tc that a time width is no more than a TD-SCDMA time slot is inserted in the descending TD-SCDMA time slot TS1, then these 3 data are merged, i.e. multiple connection becomes a complete downstream data flow shown in Fig. 5 E.The speed of above-mentioned 3 kinds of data and coded system can be diverse.To the upstream data of TD-SCDMA system, it take at most UpPTS, TS1, TS2 ..., TS5, shown in Fig. 5 F.Can use the timing shown in Fig. 5 G equally, Monitoring Data is collapsed into a burst Tm, merge with the upstream data shown in Fig. 5 F again, thereby can multiple connection become the upstream shown in Fig. 5 H.Use said method can finish the time division multiplexing that is fit to transmission requirement of the present invention.
In time-division during tap, then according to initial moment t2 (as Fig. 5 D), the t1 (as Fig. 5 C) of above-mentioned Tc, Tclk and Tm and width δ t1 (as Fig. 5 C), δ t2 (as Fig. 5 D) and the δ t3 (as Fig. 5 G) of t3 (as Fig. 5 G) and this time slot, control data, digital dock descending in each time-division tap circuit unit (as the distributor circuit among above-mentioned Fig. 3 348) reach at the monitor data up to each far end radio frequency transceiver as taking-up in the indoor base station interface card of above-mentioned Fig. 4.The width of above-mentioned δ t2 and δ t3 can be near the width of above-mentioned master data time slot, for example 600 to 650 microseconds; The width of δ t1 can be near the width of above-mentioned G+UpPTS, for example 150 to 180 microseconds.Best and the time slot aligning of above-mentioned zero-time, in the reference time in scheming, the t1=750 microsecond; The t2=1025 microsecond; The t3=0 microsecond.Like this, guaranteed that promptly various data are not overlapping in time, can use the timing base of descending reference clock again as TDD.
Shown in Figure 6 is point-to-point digital fiber transmission method when realizing the present invention to the TD-SCDMA system base station radio-frequency digital long-drawn.
The far-end that compiles and control N radio-frequency (RF) transceiver is concentrated between the far-end unit 510 that uses in the website and the indoor base station with a pair of optical fiber 205 connections.Indoor base station 600 comprises above-mentioned optical interface card 400 and base station baseband part 610.Use at far-end unit 510 places N radio-frequency (RF) transceiver 571,572 ..., 57N (radio-frequency (RF) transceiver 300 as shown in Figure 3), the calibration interface that they have the prevention at radio-frequency port of antenna respectively and need when using smart antenna.Above-mentioned radio frequency interface and calibration interface all are docking ports of one of a receipts.The digital signal of the input of this N radio-frequency (RF) transceiver, output is connected with the Optical Receivers 202 of multi-wavelength and the light emission module 201 of multi-wavelength respectively.The Optical Receivers 202 of this multi-wavelength and the light emission module 201 of multi-wavelength see Fig. 2 for details.Mandatory declaration be that the Optical Receivers 202 of this multi-wavelength will provide N+2 road receiving digital signals (using N+2 wavelength), and the light emission module 201 of multi-wavelength will provide N+1 road emission digital signal (using N+1 wavelength).The Optical Receivers 202 of this multi-wavelength receives comprises respectively N road data streams to N radio frequency sending set; One the tunnel is digital dock, and it will be connected to digital dock distributor circuit 662, is redistributed to the circuit unit that each needs, and comprises the clock interface 663 of microprocessor (MCU) 660 and each radio-frequency (RF) transceiver; One road control data, it delivers to microprocessor (MCU) 660.The light emission module 201 of this multi-wavelength sends comprises respectively from the N road receiving data stream of N radio-frequency transmitter and comes from the Monitoring Data of microprocessor (MCU) 660.This microprocessor (MCU) 660 focuses on the pilot signal of whole far-end unit 510, and one side is connected with the Optical Receivers 202 of above-mentioned multi-wavelength and the light emission module 201 of multi-wavelength.The opposing party is connected to the monitor-interface 666 of each radio-frequency (RF) transceiver.
Fig. 7～shown in Figure 9 is several different optical fiber transmission methods that connect the contact of mode to multiple spot when realizing the present invention to the TD-SCDMA system base station radio-frequency digital long-drawn.Have between the far-end unit at a plurality of remote stations place of 1 or many radio-frequency (RF) transceiver and the indoor base station 500 and connect with a pair of optical fiber 205.Indoor base station 500 includes interface card 400 and the base station baseband part among above-mentioned Fig. 4.For the purpose of simple and clear, the far-end unit 501,502 among the figure ..., 50N all only drawn a radio-frequency (RF) transceiver, the formation of each radio-frequency (RF) transceiver can be as above-mentioned Fig. 2 and shown in Figure 3.The situation that has many radio-frequency (RF) transceiver in a far-end unit equals a plurality of far-end units among the figure are placed in same place.The time of transmitting between each far end radio frequency transceiver and the indoor base station is all used time division multiplexing method shown in Figure 5; The data of each far end radio frequency transceiver all take a different optical wavelength.
In the radio frequency remote method of the digital fiber transmission of the point-to-multipoint of Y-connection shown in Figure 7, there is light to divide mixer 510 at far-end, it can be installed separately, also can integrate with any one far end radio frequency transceiver.This light divides mixer 510 to be made of one 1 to N light wavelength division multiplexing 212 and the light wavelength division multiplexing 211 of a N to 1.The similar device that uses among this light wavelength division multiplexing 212 and light wavelength division multiplexing 211 and above-mentioned Fig. 4 is identical, is the commercial goods device that can buy.By this a pair of light wavelength division multiplexing, and use time division multiplexing method shown in Figure 5, with optical fiber respectively with said distal ends radio-frequency (RF) transceiver 501,502 ... 50i, 50N realize Y-connection.
In the radio frequency remote method of the digital fiber transmission of the point-to-multipoint that chain shown in Figure 8 connects, each far end radio frequency transceiver 501,502 ... 50i, 50N be with optical fiber successively mutually after the chain serial connection, is connected with indoor base station 500 through a pair of optical fiber by the radio-frequency (RF) transceiver 501 of one end.Other far end radio frequency transceiver 501,502 except that the radio-frequency (RF) transceiver 50N that is positioned at the other end ... the 50i place respectively increase road device 471,472 under the light with the radio-frequency (RF) transceiver co-wavelength ..., 47i and light with the radio-frequency (RF) transceiver co-wavelength set out on a journey device 481,482 ..., 48i.In fact, set out on a journey device and following road device of this light all can use the integrated form light top and bottom path device (47i/48i) of commercial product.When the distal fiber 205 that interface card 400 comes out from indoor base station 500 arrives first far end radio frequency transceiver 501, by radio-frequency (RF) transceiver 501 connections therewith of first pair of light top and bottom path device 471/481; When arriving second far end radio frequency transceiver 502, by radio-frequency (RF) transceiver 502 connections therewith of second pair of light top and bottom path device 472/482, the rest may be inferred, directly connects when arriving last radio-frequency (RF) transceiver 50N.Each radio-frequency (RF) transceiver of chain serial connection is transmitted back indoor base station through uplink optical fiber of these first radio-frequency (RF) transceiver 501 usefulness after it is modulated at digital uplink signal on the wavelength separately respectively and closes the road step by step successively from far near.Use this method, the damage of any one far end radio frequency transceiver can not influence the operate as normal of other far end radio frequency transceiver in this chain.
In the radio frequency remote method of the digital fiber transmission of the point-to-multipoint that annular shown in Figure 9 connects, each far end radio frequency transceiver 501,502, ... 50i, adopt between 50N and be connected in series with the chain successively of Fig. 8 same way as, difference is to have used the same-interface card 400 of two Fig. 4 forms in indoor base station 500, and at each the far end radio frequency transceiver 501 that is positioned at this chain serial connection, 502, ... 50i, when the radio-frequency (RF) transceiver 501 at 50N one end place is connected with an interface card 400 of indoor base station 500 with a pair of optical fiber through light top and bottom path device 47N/48N, also with another optical fiber 205 is connected to the another interface card 400 of indoor base station through light top and bottom path device 47N/48N between the radio-frequency (RF) transceiver 50N at other end place and the indoor base station 500, forms annular and connect with the same manner.These two pairs of optical fiber that said each radio-frequency (RF) transceiver is connected with indoor base station 500 at one time can simultaneously or only have one of them in running order.Corresponding with it, descending/upward signal between indoor base station 500 and each the far end radio frequency transceiver that is connected in series successively just both can be respectively through two pairs of optical fiber with circular pattern transmission (for example when outage occurs in the optical fiber transmission path), also can make wherein a pair of optical fiber as standby and only optical fiber is done and the transmission (for example under normal condition) of Fig. 8 similar fashion with another.Therefore, this annular connects than above-mentioned chain connection can higher reliability, and all other can not influence the operate as normal of other far end radio frequency transceiver for any device damage or fiber break in ring.
The above embodiments can help more to be expressly understood content of the present invention, but these embodiment should be interpreted as it is restriction to subject area of the present invention.Not breaking away from and changing under the above-mentioned technological thought situation of the present invention,, obviously can also make the replacement or the change of various ways, and all should comprise within the scope of the present invention according to the ordinary skill knowledge and/or the customary means of this area.
Claims (10)
1. the optical fiber transmission method that is used for the TD-SCDMA system base station radio-frequency digital long-drawn, the baseband digital signal processing section of radio-frequency (RF) transceiver in the wireless base station with the wireless base station separated, and radio-frequency (RF) transceiver zoomed out near antenna, after it is characterized in that making the intermediate frequency port digitlization of radio-frequency (RF) transceiver, the digital data stream signal that each radio-frequency (RF) transceiver is received and launches, control or monitoring digital signal, and the reference number clock signal is modulated on the corresponding optical wavelength respectively, after will closing the road with the corresponding lightwave signal of each radio-frequency (RF) transceiver with wave division multiplex mode, carry out the transmission of up direction and down direction with one with optical fiber respectively, receiving terminal then again by wavelength separately and respectively demodulation revert to digital signal corresponding, wavelength division multiplexing wherein is according to the frame structure of TD-SCDMA system and time division duplex working method, earlier with the time division multiplexing mode digital data stream signal that speed is different with coded system, control or monitoring digital signal, and reference number clock signal, by the time separately and respectively multiple connection be one group of serial data stream, detailed process is:
A. in the frame structure of TD-SCDMA system and time division duplex work system, carry out wave division multiplex mode when handling, with earlier that speed is different with the coded system digital data stream signal of time division multiplexing mode, control or monitoring digital signal and reference number clock signal by the time separately and respectively multiple connection be one group of serial data stream, wherein:
When each far end radio frequency transceiver carries out the tap of uplink, pick out corresponding data at different moment branches, and its Monitoring Data is compressed into after short burst (Tm) that a time width is no more than a TD-SCDMA time slot is inserted in the up TD-SCDMA time slot TS0, become a complete upstream with the up reception data multiplexing that is present among the TS1 to TS5;
Indoor base station will be used for control data to each far end radio frequency transceiver and be compressed into the short burst (Tc) that a time width is no more than a TD-SCDMA time slot and be inserted in the descending TD-SCDMA time slot TS1, the reference number clock signal that provides is compressed into time width is no more than another short burst (Tclk) and is inserted in the interval that comprises protection time slot (G) and up guide time slot (UpPTS) sum by protection time slot (G) and up guide time slot (UpPTS) sum, these two short bursts with become a complete downstream data flow at TS0 and the downlink data multiplexing that is present among the TS2 to TS6;
B. the far end radio frequency transceiver relates to digital data stream signal, control or monitors digital signal and the different up and downlink data of reference number clock signal multichannel what transmitted with indoor base station, is modulated on the specific wavelength of light after the transmitting terminal multiple connection becomes one tunnel data flow of separating by the time respectively and transmits; Corresponding receiving terminal carries out tap and reverts to corresponding multichannel data according to the content of data in the different time-gap again the data flow that is received.
2. the optical fiber transmission method that is used for the TD-SCDMA system base station radio-frequency digital long-drawn as claimed in claim 1, it is characterized in that said elder generation with the time division multiplexing mode digital data stream signal that speed is different with coded system, control or monitoring digital signal and reference number clock signal by the time separately and respectively multiple connection be that the process of one group of serial data stream is:
When each far end radio frequency transceiver carries out the tap of uplink, pick out corresponding data at different moment branches, and its Monitoring Data is compressed into after short burst (Tm) that a time width is no more than a TD-SCDMA time slot is inserted in the up TD-SCDMA time slot TS0, become a complete upstream with the up reception data multiplexing that is present among the TS1 to TS5;
Indoor base station will be used for control data to each far end radio frequency transceiver and be compressed into the short burst (Tc) that a time width is no more than a TD-SCDMA time slot and be inserted in the descending TD-SCDMA time slot TS1, the reference number clock signal that provides is compressed into time width is no more than another short burst (Tclk) and is inserted in the interval that comprises protection time slot (G) and up guide time slot (UpPTS) sum by protection time slot (G) and up guide time slot (UpPTS) sum, these two short bursts with become a complete downstream data flow at TS0 and the downlink data multiplexing that is present among the TS2 to TS6;
The far end radio frequency transceiver relates to digital data stream signal, control or monitors digital signal and the different up and downlink data of reference number clock signal multichannel what transmitted with indoor base station, is modulated on the specific wavelength of light after the transmitting terminal multiple connection becomes one tunnel data flow of separating by the time respectively and transmits; Corresponding receiving terminal carries out tap and reverts to corresponding multichannel data according to the content of data in the different time-gap again the data flow that is received.
3. the optical fiber transmission method that is used for the TD-SCDMA system base station radio-frequency digital long-drawn as claimed in claim 1 or 2, it is characterized in that indoor base station and compile when carrying out the transmission of point-to-point formula between the concentrated site that a plurality of radio-frequency (RF) transceiver are arranged, the monitoring digital signal to a plurality of radio-frequency (RF) transceiver of the received digital data stream signal of each radio-frequency (RF) transceiver that this concentrated site connects, this concentrated site is modulated at respectively on the optical wavelength, transfers to indoor base station through uplink optical fiber of photosynthetic Lu Houyong; Respectively be modulated at respectively on the optical wavelength from indoor base station and through the digital data stream signal of each radio-frequency (RF) transceiver emission, digital signal and the reference number clock signal that indoor base station is controlled these radio-frequency (RF) transceiver, transfer to this concentrated site through downlink optical fiber of photosynthetic Lu Houyong; At each receiving terminal place then by the wavelength of received signal separately and respectively demodulation revert to digital signal corresponding.
4. the optical fiber transmission method that is used for the TD-SCDMA system base station radio-frequency digital long-drawn as claimed in claim 1 or 2, when it is characterized in that indoor base station and a plurality of far end radio frequency transceivers that lay respectively at diverse location carry out point-to-points point type transmission, uplink and downlink digital signal between indoor base station and each far end radio frequency transceiver is distinguished respectively with an Optical Fiber Transmission, wherein, the uplink signal of each far end radio frequency transceiver is for monitoring the whole number signal that digital signal is multiplexed in the time division multiplexing mode with digital data stream signal and this radio-frequency (RF) transceiver that this radio-frequency (RF) transceiver receives; The whole number signal that is multiplexed to for the digital signal the digital data stream signal of this radio-frequency (RF) transceiver emission, indoor base station controlled this radio-frequency (RF) transceiver in the time division multiplexing mode and reference number clock signal by the downstream transmission signals of indoor base station.
5. the optical fiber transmission method that is used for the TD-SCDMA system base station radio-frequency digital long-drawn as claimed in claim 4, the Y-connection mode is adopted in the point-to-points point type transmission that it is characterized in that indoor base station and lay respectively between a plurality of far end radio frequency transceivers of diverse location, between indoor base station and each far end radio frequency transceiver up/be modulated at separately on the wavelength in the time division multiplexing mode respectively during downlink transfer, directly be connected transmission by indoor base station with each far end radio frequency transceiver with separate a pair of optical fiber respectively.
6. the optical fiber transmission method that is used for the TD-SCDMA system base station radio-frequency digital long-drawn as claimed in claim 4, the chain connected mode is adopted in the point-to-points point type transmission that it is characterized in that indoor base station and lay respectively between a plurality of far end radio frequency transceivers of diverse location, after it being modulated at uplink digital optical signal on the different wave length respectively and closing the road step by step successively, be connected with indoor base station with an optical fiber by the radio-frequency (RF) transceiver that is positioned at an end position in its chain type serial connection with each far end radio frequency transceiver of optical fiber chain type successively serial connection; The downlink transfer digital signal that indoor base station is sent to a plurality of far end radio frequency transceivers is modulated at respectively on the corresponding different wave length, another root optical fiber of ECDC Lu Houyong is connected with the radio-frequency (RF) transceiver that is positioned at this end position, transfer to each radio-frequency (RF) transceiver of other end direction more successively, and enter the corresponding radio frequency transceiver by the optical branching device of each radio-frequency (RF) transceiver.
7. the optical fiber transmission method that is used for the TD-SCDMA system base station radio-frequency digital long-drawn as claimed in claim 4, annular connected mode is adopted in the point-to-points point type transmission that it is characterized in that indoor base station and lay respectively between a plurality of far end radio frequency transceivers of diverse location, the radio-frequency (RF) transceiver that is positioned at each the far end radio frequency transceiver end positions place that is connected in series successively by optical fiber respectively is connected with indoor base station respectively with a pair of optical fiber with the same manner, each far end radio frequency transceiver is after being modulated at uplink digital signal on the wavelength separately respectively and closing the road step by step successively by an end to the other end, is connected with indoor base station through a pair of optical fiber wherein; The downlink transfer digital signal that indoor base station is sent to a plurality of far end radio frequency transceivers is modulated on the different wave length respectively, close and also optical fiber delivered to each far end radio frequency transceiver behind the road and the optical branching device through each radio-frequency (RF) transceiver place enters each corresponding far end radio frequency transceiver by this, at one time between said far end radio frequency transceiver and indoor base station at least one pair of in the two pairs of optical fiber in running order.
8. the radio-frequency (RF) transceiver that is used for the optical fiber transmission method of the described TD-SCDMA system base station radio-frequency digital long-drawn of claim 1, it is characterized in that comprising in the structure digital received unit (302) that has time division multiplexing circuit and specific wavelength optical sender, have the digital transmission unit (303) that time-division branch connection circuit and optical receiver are formed, clock recovery and distributor circuit unit (348) and the microprocessor unit (355) that this radio-frequency (RF) transceiver is monitored, digital received unit (302) are connected with antenna port (360) through time division duplex device unit (301) respectively with digital transmission unit (303); From signal of base station through downlink transfer optical fiber (365) enter that digital received unit (302) is demodulated into downlink data, digital dock data and to these radio-frequency (RF) transceiver control data three tunnel dateouts after, wherein one the tunnel send into digital transmission unit (303) and deliver to antenna element port 360 for the downlink data through time division duplex device unit (301); Another road is delivered to digital received unit (302), digital transmission unit (303) and microprocessor unit (355) for the digital dock data enter respectively after clock recovery and distributor circuit (348) are handled; One the tunnel for to deliver to the microprocessor unit (355) that is used to monitor to the control data of this radio-frequency (RF) transceiver again, and after by microprocessor unit (355) monitor signal being sent into connected digital received unit (302), with the received signal that enters by antenna element port (360) and time division duplex device unit (301), the complete data flow of uploading is exported by uplink optical fiber (361) through its time-division multiplex circuit and specific wavelength optical sender.
9. radio-frequency (RF) transceiver as claimed in claim 8 is characterized in that analog receiver (310) that is connected with its local oscillation circuit (331) and the analog/digital converter (341) that is linked in sequence thereafter being arranged in the said digital received unit (302) that has time division multiplexing circuit and a specific wavelength optical sender, receiving digital intermediate frequency circuit (342), time division multiplexing circuit (343) and the specific wavelength optical sender (344) that is connected with uplink optical fiber (361); The digital/analog converter (351), emission digital intermediate frequency circuit (352), the time-division that have the simulating transmitting machine (320) that is connected with its local oscillation circuit (332) and front end thereof to be linked in sequence in the digital transmission unit (303) are divided connection circuit (353) and the optical receiver (354) that is connected with downlink transfer optical fiber (365); Said analog receiver (310) is for including the conventional superheterodyne receiver of low noise amplifier (311), frequency mixer (312) and analog intermediate frequency circuit (313) basic structure; Simulating transmitting machine (320) in the digital transmission unit (303) is for including the conventional superhet transmitter of power amplifier (321), frequency mixer (322) and analog intermediate frequency circuit (323) basic structure; Said time division duplex device unit (301) is made up of band pass filter (345) and circulator (346); The time-division that is connected with optical receiver (354) in the digital transmission unit (303) divides connection circuit (353) will be demodulated into said three road output streams from the downlink data of base station, downlink data are wherein delivered to the emission digital intermediate frequency circuit (352) that is connected with simulating transmitting machine (320) in the said digital transmission unit (303), the digital dock data are delivered to said clock recovery and distributor circuit (348) and are delivered to analog/digital converter (341) and time division multiplexing circuit (343) in the digital received unit (302) respectively by it, and digital/analog converter (351) in digital transmission unit (303) and time-division branch connection circuit (353), control data to this radio-frequency (RF) transceiver is delivered to microprocessor unit (355) through monitor-interface (366), microprocessor unit (355) also is connected with time division multiplexing circuit (343) in digital received unit (302) monitor signal is delivered to this time division multiplexing circuit (343), and and is multiplexed to a complete data flow of uploading from the receiving digital signals that receives digital intermediate frequency circuit (342) and delivers to specific wavelength optical sender (344) and export through uplink optical fiber (361).
10. the indoor base station interface card that is used for the described TD-SCDMA system base station radio-frequency digital long-drawn of claim 1 optical fiber transmission method, it is characterized in that having in the interface card (400) one group of multi-wavelength light transmitter unit (201) and light receiving unit (202), the emission digital multiplexing circuit unit (451) that is connected with this Unit two respectively and reception digital demulplexing circuit unit (452) and microprocessor unit (460), wherein:
Have in the multi-wavelength light transmitter unit (201) that output is connected with descending output optical fibre interface (401), input respectively with corresponding to the required variant specific wavelength optical sender (231 of far end radio frequency transceiver, 232,23N) the optical wavelength-division multiplex unit (211) of Lian Jieing, the input of said variant specific wavelength optical sender respectively with have baseband digital signal processing unit (471), reference number clock unit (480) and the corresponding interface of the emission digital multiplexing circuit unit (451) of microprocessor unit (460) input port and be connected;
Have in the light receiving unit (202) that input is connected with up input optical fibre interface (402), output respectively with each optical receiver (251 of requirement, 252,25N) the optical wavelength-division multiplex unit (212) of Lian Jieing, the output of said each optical receiver respectively with have the corresponding interface of baseband digital signal processing unit (472) and be connected with the reception digital demulplexing circuit unit (452) of microprocessor unit (460) output port;
Microprocessor unit (460) also provides the connectivity port (490) with the base station main control processor simultaneously.
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| CN100493264C (en) * | 2006-09-22 | 2009-05-27 | 华为技术有限公司 | Uplink and downlink signal merging method under sector discerption mode and base station system |
| CN101557253B (en) * | 2008-04-09 | 2012-07-18 | 邦讯技术股份有限公司 | TD-SCDMA fiber optic repeater and method for processing uplink and downlink of signals |
| CN102396252A (en) * | 2009-09-07 | 2012-03-28 | 爱立信(中国)通信有限公司 | Method and apparatus for cell combination |
| CN102315880A (en) * | 2010-07-05 | 2012-01-11 | 大唐移动通信设备有限公司 | Light path transmission method and device |
| CN103401613B (en) * | 2013-08-02 | 2015-09-30 | 武汉虹信通信技术有限责任公司 | A kind of Techniques Used in Digital Microwave Transmission device and method |
| US9716573B2 (en) | 2014-06-13 | 2017-07-25 | Futurewei Technologies, Inc. | Aggregated touchless wireless fronthaul |
| CN104301044A (en) * | 2014-09-28 | 2015-01-21 | 成都九华圆通科技发展有限公司 | Wide-frequency-band high-sensitivity large-spurious-free-dynamic-range light receiving box and light receiving method thereof |
| US9755779B2 (en) * | 2015-04-17 | 2017-09-05 | Futurewei Technologies, Inc. | Digital representations of analog signals and control words using different multi-level modulation formats |
| US10027413B2 (en) | 2015-06-18 | 2018-07-17 | Futurewei Technologies, Inc. | Cascaded waveform modulation with an embedded control signal for high-performance mobile fronthaul |
| CN106129562A (en) * | 2016-08-29 | 2016-11-16 | 成都奥克特科技有限公司 | Multi-standard base station is with location method of work |
| CN110324085B (en) * | 2019-07-08 | 2021-05-18 | 武汉虹信科技发展有限责任公司 | Antenna data processing method and Radio Remote Unit (RRU) |
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